Question

use the following information to answer questions 17 - 19. laura decides to go on a walk. she starts by walking 50 meters north in 20 seconds. she then turns around abruptly and walks south for 20 meters in 10 seconds. finally, laura walks 10 meters north in 7 seconds. question 17 calculate the total distance laura walked. a. 37 meters b. 40 meters c. 80 meters d. 117 meters question 18 how can lauras displacement and total trip time be determined? check all that apply +50m - 20m + 10m = 40 meters north of starting position +50m + 20m + 10m = 80 meters total displacement +50m - 20m + 10m = 40 meters south of starting position 20s - 10s + 7s = 17s 20s + 10s + 7s

Explanation:

Step1: Define total - distance concept

Total distance is sum of all distances walked.

Step2: Add up distances

$50 + 20+10=80$ (meters)

Step1: Define displacement and time concepts

Displacement is net change in position, time is sum of all time - intervals.

Step2: Calculate displacement

North is positive, south is negative. Displacement: $50 - 20+10 = 40$ meters north.

Step3: Calculate total time

Total time: $20 + 10+7=37$ seconds.

Answer:

C. 80 meters